the focal length of a concave mirror is always negative or positive（関連順）

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The focal length of a concave mirror is negative while that of a convex mirror is positive, why?

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One of the following does not apply to a concave mirror. This is :(a) focal length is negative (b...

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focal length condition to be negative or positive

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結果 : the focal length of a concave mirror is always negative or positive